错误：
org.apache.ibatis.binding.BindingException: Type interface com.kuang.dao.UserDAO is not known to the MapperRegistry.
错误：
java.lang.ExceptionInInitializerError
原因1：没有添加mappers
原因2：手动添加
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
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